AKTU Analog Circuits · Important Questions 2026Source: ryzenstudy.com PYQs
BEC402 Analog Circuits Important Questions 2026 (AKTU)
Repeat analysis + most-asked questions, unit-wise
What we did: built from all 4 AKTU Analog Circuits papers (2021-22–2025-26): 92 questions grouped into 66 distinct questions, 17 of which were asked in more than one paper.
- of marks were repeat questions
- 41%
- of marks were repeat questions
- questions asked in 2+ papers
- 17
- questions asked in 2+ papers
- papers analysed (2021-22–2025-26)
- 4
- papers analysed (2021-22–2025-26)
- units, mapped to current syllabus
- 5
- units, mapped to current syllabus
How much of the paper repeats?
- Repeats are real: when we checked each newer BEC402 paper against the papers before it, on average 41% of its marks were questions already asked in an earlier paper.
- 2024-25 paper: 17% of marks were repeats (2 of 4 repeated questions were in our top list).
- 2025-26 paper: 65% of marks were repeats (6 of 15 repeated questions were in our top list).
- Topic weightage is a guide, not a guarantee: our Tier 1 + Tier 2 topics covered 62% of the next paper's marks — picking the same number of topics at random would have covered about 56%.
Across 10 subjects and 23 papers we tested, 43% of marks repeated earlier questions on average.
1.Unit-wise most-asked questions
Ranked by how many papers asked them, then by how recently. Click a paper to open it.
Unit 1: Amplifier models
21% of past marks| Question | Asked |
|---|---|
| Describe emitter follower. Derive expression for gain, input & output resistance. | Asked 2× |
| Derive the expressions for input impedance, output impedance, open circuit voltage gain, overall voltage gain and short circuit current gain after completing the AC analysis of common emitter amplifier with emitter resistance. | Asked 2× |
| Define the terms voltage amplifier, current amplifier. | Asked 2× |
| Derive the expression of voltage gain, input resistance and output resistance of common source amplifier with source resistance. 7 marks2025-26 Q3(a) | Asked 1× |
Unit 2: Frequency response of Amplifiers
20% of past marks| Question | Asked |
|---|---|
| Describe the current Shunt feedback topology. Calculate the voltage gain, input and output resistance of voltage series feedback amplifier having Av = 300, Ri = 1.5 kΩ, Ro = 50 kΩ and β = 1/15. | Asked 2× |
| Design a series-series feedback amplifier and calculate expressions for Af, Rof and Rif. | Asked 2× |
| Explain the concept of gain margin and phase margin in amplifier stability. | Asked 2× |
| How does feedback affect the gain of an amplifier? | Asked 2× |
Unit 3: Oscillators
19% of past marks| Question | Asked |
|---|---|
| Explain Barkhausen criterion for oscillation. | Asked 4× |
| Derive the expression of frequency of oscillation for RC phase shift oscillator. Explain its salient features. | Asked 2× |
| Explain the working of a tank circuit. Also derive the frequency of oscillation and condition of gain to get sustained oscillations for Colpitts oscillator. | Asked 2× |
| Explain the operation of a Wien bridge oscillator. Calculate the frequency of oscillation for given values of R1 and R2 = 100 kΩ, C1 and C2 = 50 pF. | Asked 2× |
Unit 4: Current mirror
24% of past marks| Question | Asked |
|---|---|
| Define minimum sustainable voltage and maximum usable load of a Current mirror Circuits. | Asked 3× |
| Explain the term Input Common Mode Range (ICMR) and its significance in differential amplifier design. | Asked 2× |
| If differential mode gain of a differential amplifier is 1000 and common mode gain is 10, calculate the CMRR in decibel for it. | Asked 2× |
| Draw the basic structure of differential amplifier and calculate the differential gain, common mode gain and CMRR. | Asked 2× |
Unit 5: Op-Amp applications
18% of past marks| Question | Asked |
|---|---|
| Explain Class B operation in amplifiers and discuss its drawback. How it can be overcome. | Asked 3× |
| What is Super Diode? Describe the working of half wave precision rectifier giving its transfer characteristic. 7 marks2025-26 Q2(e) | Asked 1× |
| Draw Op-Amp based Schmitt Trigger Circuit and explain its operation, hysteresis loop and applications. 7 marks2025-26 Q7(a) | Asked 1× |
| In a non-inverting Op-Amp given that input voltage is 0.5 V, Rf = 100 kΩ and Rin = 10 kΩ, then what is the output voltage? 2 marks2025-26 Q1(g) | Asked 1× |
2.Topic weightage: which topics carry the marks
Blue = Tier 1 + Tier 2 (topics that carried ~80% of past marks). Grey = the rest. It shows where marks have gone, not a promise of what comes next.
Feedback topologies · U2
8.5% (cum 9%)
Differential gain and CMRR · U4
7.4% (cum 16%)
BJT amplifier AC analysis · U1
6.7% (cum 23%)
Wien bridge oscillator · U3
5.4% (cum 28%)
Amplifier types and models · U1
5.1% (cum 33%)
Amplifier classes · U5
4.6% (cum 38%)
BJT small-signal models · U1
4.3% (cum 42%)
Barkhausen criterion and basics · U3
4.3% (cum 46%)
Current mirror basics and variants · U4
4.1% (cum 50%)
MOSFET amplifier analysis · U1
3.9% (cum 54%)
Effect of feedback · U2
3.3% (cum 58%)
Integrator and differentiator · U5
3.1% (cum 61%)
RC phase shift oscillator · U3
2.8% (cum 63%)
Differential amplifier operation · U4
2.8% (cum 66%)
Precision rectifier · U5
2.8% (cum 69%)
Mirror output resistance and VON · U4
2.7% (cum 72%)
Single-stage frequency response · U2
2.6% (cum 74%)
Hartley oscillator · U3
2.6% (cum 77%)
Colpitts and Clapp oscillators · U3
2.6% (cum 80%)
ICMR · U4
2.6% (cum 82%)
Summing amplifier · U5
2.6% (cum 85%)
Inverting and non-inverting amplifiers · U5
2.6% (cum 87%)
Op-amp design stages · U4
2.6% (cum 90%)
Stability and margins · U2
2% (cum 92%)
High frequency transistor models · U2
1.8% (cum 94%)
Multistage and cascade response · U2
1.3% (cum 95%)
Op-amp compensation · U4
1.3% (cum 96%)
Schmitt trigger · U5
1.3% (cum 98%)
Gain and resistance estimation · U1
0.7% (cum 98%)
Crystal oscillator · U3
0.7% (cum 99%)
Efficiency and linearity · U5
0.5% (cum 100%)
| Topic | Papers | Share |
|---|---|---|
| Feedback topologies · Unit 2 · Tier 1 | 4/4 | 8.5% |
| Differential gain and CMRR · Unit 4 · Tier 1 | 4/4 | 7.4% |
| BJT amplifier AC analysis · Unit 1 · Tier 1 | 3/4 | 6.7% |
| Wien bridge oscillator · Unit 3 · Tier 1 | 4/4 | 5.4% |
| Amplifier types and models · Unit 1 · Tier 1 | 3/4 | 5.1% |
| Amplifier classes · Unit 5 · Tier 1 | 3/4 | 4.6% |
| BJT small-signal models · Unit 1 · Tier 1 | 2/4 | 4.3% |
| Barkhausen criterion and basics · Unit 3 · Tier 1 | 4/4 | 4.3% |
| Current mirror basics and variants · Unit 4 · Tier 1 | 3/4 | 4.1% |
| MOSFET amplifier analysis · Unit 1 · Tier 2 | 2/4 | 3.9% |
| Effect of feedback · Unit 2 · Tier 2 | 3/4 | 3.3% |
| Integrator and differentiator · Unit 5 · Tier 2 | 2/4 | 3.1% |
| RC phase shift oscillator · Unit 3 · Tier 2 | 2/4 | 2.8% |
| Differential amplifier operation · Unit 4 · Tier 2 | 2/4 | 2.8% |
| Precision rectifier · Unit 5 · Tier 2 | 2/4 | 2.8% |
| Mirror output resistance and VON · Unit 4 · Tier 2 | 4/4 | 2.7% |
| Single-stage frequency response · Unit 2 · Tier 2 | 2/4 | 2.6% |
| Hartley oscillator · Unit 3 · Tier 2 | 2/4 | 2.6% |
| Colpitts and Clapp oscillators · Unit 3 · Tier 2 | 2/4 | 2.6% |
| ICMR · Unit 4 · Tier 2 | 2/4 | 2.6% |
| Summing amplifier · Unit 5 · Tier 3 | 2/4 | 2.6% |
| Inverting and non-inverting amplifiers · Unit 5 · Tier 3 | 3/4 | 2.6% |
| Op-amp design stages · Unit 4 · Tier 3 | 2/4 | 2.6% |
| Stability and margins · Unit 2 · Tier 3 | 2/4 | 2% |
| High frequency transistor models · Unit 2 · Tier 3 | 2/4 | 1.8% |
| Multistage and cascade response · Unit 2 · Tier 3 | 1/4 | 1.3% |
| Op-amp compensation · Unit 4 · Tier 3 | 1/4 | 1.3% |
| Schmitt trigger · Unit 5 · Tier 3 | 1/4 | 1.3% |
| Gain and resistance estimation · Unit 1 · Tier 3 | 1/4 | 0.7% |
| Crystal oscillator · Unit 3 · Tier 3 | 1/4 | 0.7% |
| Efficiency and linearity · Unit 5 · Tier 3 | 1/4 | 0.5% |
3.Paper pattern (2025-26)
| Section | Questions | Rule |
|---|---|---|
| A | 7 × 2 marks | Attempt all |
| B | 5 × 7 marks | Attempt any 3 |
| C | 10 × 7 marks | Attempt any 1 |
4.In the syllabus, never asked yet
Low priority, but read them once — a new paper can always start here.
- Multistage amplifiers (low frequency) · U1
5.Study order
- 1Feedback topologies (Unit 2, Tier 1)
- 2Differential gain and CMRR (Unit 4, Tier 1)
- 3BJT amplifier AC analysis (Unit 1, Tier 1)
- 4Wien bridge oscillator (Unit 3, Tier 1)
- 5Amplifier types and models (Unit 1, Tier 1)
- 6Amplifier classes (Unit 5, Tier 1)
- 7BJT small-signal models (Unit 1, Tier 1)
- 8Barkhausen criterion and basics (Unit 3, Tier 1)
- 9Current mirror basics and variants (Unit 4, Tier 1)
- 10MOSFET amplifier analysis (Unit 1, Tier 2)
- 11Effect of feedback (Unit 2, Tier 2)
- 12Integrator and differentiator (Unit 5, Tier 2)
- 13RC phase shift oscillator (Unit 3, Tier 2)
- 14Differential amplifier operation (Unit 4, Tier 2)
- 15Precision rectifier (Unit 5, Tier 2)
- 16Mirror output resistance and VON (Unit 4, Tier 2)
- 17Single-stage frequency response (Unit 2, Tier 2)
- 18Hartley oscillator (Unit 3, Tier 2)
- 19Colpitts and Clapp oscillators (Unit 3, Tier 2)
- 20ICMR (Unit 4, Tier 2)
FAQ
Which units of BEC402 carry the most marks?
Unit 4 (Current mirror, 24% of past marks) and Unit 1 (Amplifier models, 21% of past marks).
Do AKTU Analog Circuits questions repeat?
Yes. On average 41% of the marks in each newer BEC402 paper came from questions already asked in an earlier paper, and 17 questions have appeared in more than one paper.
How is this list made?
Every question from the 4 papers (2021-22–2025-26) was mapped to the current AKTU syllabus and grouped with the same question from other years. Questions are ranked by how many papers they appeared in, then by how recently.
Study this subject
Note: this is based on past AKTU papers, not a guarantee. Questions are mapped to the current syllabus; topics that are no longer in the syllabus are left out.